Fix missing null termination in DPDK EAL Args

Change-Id: I8292628ad359a19e02ff79568d773ad2b1af51ec
Signed-off-by: Damjan Marion <damarion@cisco.com>
diff --git a/vnet/vnet/devices/dpdk/init.c b/vnet/vnet/devices/dpdk/init.c
index b49c405..63af5b3 100644
--- a/vnet/vnet/devices/dpdk/init.c
+++ b/vnet/vnet/devices/dpdk/init.c
@@ -1282,14 +1282,14 @@
       {
 	tmp = format (0, "-w%c", 0);
 	vec_add1 (conf->eal_init_args, tmp);
-	tmp = format (0, "%U%c", format_vlib_pci_addr, &devconf->pci_addr);
+	tmp = format (0, "%U%c", format_vlib_pci_addr, &devconf->pci_addr, 0);
 	vec_add1 (conf->eal_init_args, tmp);
       }
     else if (num_whitelisted == 0 && devconf->is_blacklisted != 0)
       {
 	tmp = format (0, "-b%c", 0);
 	vec_add1 (conf->eal_init_args, tmp);
-	tmp = format (0, "%U%c", format_vlib_pci_addr, &devconf->pci_addr);
+	tmp = format (0, "%U%c", format_vlib_pci_addr, &devconf->pci_addr, 0);
 	vec_add1 (conf->eal_init_args, tmp);
       }
   }));